The following may be useful to gain a better understanding of LmdbJava and LMDB.

The following issues in this repository may provide useful information for working with LmdbJava.

Buffers, Copying and Reuse

How to boost performance

Performance Issue of Bulk Load

Write Performance

The following links provide useful background information about LMDB itself.

LMDB architecture and design presentation

Another similar LMDB presentation

LMDB home page

LMDB command line tools

LMDB C API